diff --git a/static/js/app.js b/static/js/app.js
new file mode 100644
index 0000000..b1822ce
--- /dev/null
+++ b/static/js/app.js
@@ -0,0 +1,10 @@
+// Minimal client-side helpers
+document.querySelectorAll('form').forEach((form) => {
+    form.addEventListener('submit', (e) => {
+        const btn = form.querySelector('button[type="submit"]');
+        if (btn && !btn.disabled) {
+            btn.disabled = true;
+            btn.textContent = 'Загрузка…';
+        }
+    });
+});